.l_alter{
    transition: .2s;
    color: #ccc;
    position: relative;
    width: 0;
    height: 0;
}
/* 弹框打开状态 */
.l_alter._show{
    transform: scale(1);
}
/* 弹框关闭状态 */
.l_alter._hide{
    transform: scale(0);
}
.l_alter .l_footer{
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 40px;
    text-align: center;
}
.l_alter .l_button{
    display: inline;
    padding: 3px 6px;
    border: 1px solid #ccc;
    transition: .2s;
}
.l_alter .l_button:hover{
    background-color: rgba(255,255,255,.3);
}